simple gulp test

_breakpoints.scss

// grid breakpoints, created with gulp task and yaml config
// created at: Wed Mar 21 2018 20:51:44 GMT+0100 (CET)
$grid-breakpoints: (
	xs: 0,
	sm: 576px,
	md: 768px,
	lg: 992px,
	xl: 1200px,
	xxl: 1380px,
);

config.yaml

- breakpoints: {
  export: {
    scss: src/scss/abstracts/_breakpoints.scss,
  },
  values: {
    xs: 0,
    sm: 576px,
    md: 768px,
    lg: 992px,
    xl: 1200px,
    xxl: 1380px
  }
}

gulpfile.js

    gulp.task('test', function(){
        read('src/data/config.yaml', function(err, data) {
            if (err) {
                return console.log(err);
            }

            for (key in data) {
                var _entry = data[key];
                if (_entry.breakpoints) {
                    var _return = [];
                    for(exports in _entry.breakpoints.export) {
                        if (exports == 'scss') {
                            _return.push('// grid breakpoints, created with gulp task and yaml config');
                            _return.push('// created at: '+ new Date().toString());
                            _return.push('$grid-breakpoints: (');

                            for (breakpoint in _entry.breakpoints.values) {
                                _return.push('\t'+ breakpoint +': '+ _entry.breakpoints.values[breakpoint] +',');
                            }
                            _return.push(');');
                        }

                        writeFile(_entry.breakpoints.export[exports],  _return.join('\n'), function(err) {
                            if (err) console.log(err);
                        });
                    }
                }
            }
        });
    });